#include<bits/stdc++.h>
using namespace std;
struct myint {
    char num[1000];
    int len;
    void operator= (char *x) {
        len=strlen(x);
        for(int i=0;i<len;i++) {
            num[i]=x[i];
        }
    }
    myint operator+ (myint x) {
        if(x.num[0]=='0') {
            throw new exception;
        }

    } 
};